It delivers PCIe 4.0 speed without the use of retimers or updated motherboard using MEGTRON 6 other exotic laminates.

This demo suggests a solution to overcoming the inherent limitations of maintaining PCIe 4.0 performance over long distances without changing the motherboard technology or using costly retimers.

New PCIe 4.0 Applications

As cloud computing and deep learning accelerators drive faster advances in the PCIe roadmap, existing hardware designs cannot support the higher speed signals over the same distances. The PCIe 1.0 specification allowed signals to travel as much as 20 inches over traces in mainstream FR4 boards, even while passing through two connectors.

In contrast, today’s quicker 16 GT/s PCIe 4.0 signals will peter out in under six inches and without going over any connectors. In today’s designs, PCIe 4.0 signals can only travel three to five inches, requiring costly redesigns, moving to MEGTRON 6 and adding a retimer for increased distance.

PLDA’s demo shows a system running at 16 GT/s and displaying relevant throughput and latency measurements. The demo result shows the bandwidth is not impacted by distance when using copper or optical fibers.

By using optical fibers, PLDA and Samtec demonstrate that PCIe 4.0 can be used for remote applications (e.g. EMI sensitive environments)

By using passive Twinax Flyover™ Systems, PLDA and Samtec show a differentiated and affordable way to design a PCIe 4.0 platform. According to Rick Merritt, adding retimers could cost between $15 to $25 for 16 lanes of PCIe 4.0 at 16GT/s, plus an additional $300 for updating the motherboard PCB material.

“PCIe Designers are delaying their upgrade to the next generation of PCIe because they anticipate high board manufacturing costs, said Hugues Deneux, COO of PLDA. “With this demo, we want to show a new approach that provides great bandwidth and good latency over any distance for PCIe 4.0 communications.”

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